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• W2116723357 abstract "ABSTRACT Transcription factor E2F plays an important role in co-ordinating and integrating early cell cycle progression with the transcription apparatus. It is known that physiological E2F arises when a member of two families of proteins, E2F and DP, interact as E2F/DP heterodimers and that transcriptional activity is regulated through the physical association of pocket proteins such as pRb. However, little information is available regarding the mechanisms which control the levels of functional E2F. In this study, we have characterised one such mechanism which regulates the nuclear accumulation and activity of E2F. Specifically, we show that E2F proteins fall into two distinct categories according to their ability to accumulate in nuclei, one being exemplified by E2F-1 and the other by E2F-4 and -5. Thus, E2F-1 possesses an intrinsic nuclear localization signal whereas E2F-4 and -5 are devoid of such a signal. Furthermore, we find for E2F-4 and -5 that two distinct processes govern their nuclear accumulation whereby the nuclear localization signal is supplied in trans from either a DP heterodimer partner or a physically associated pocket protein. It is consistent with the role of pocket proteins in regulating nuclear accumulation that we find E2F-5 to be nuclear during early cell cycle progression with an increased cytoplasmic concentration in cycling cells. Our data show that the mechanism of nuclear accumulation determines the functional consequence of E2F on cell cycle progression: pocket protein-mediated accumulation impedes cell cycle progression, whereas DP-regulated nuclear accumulation promotes cell cycle progression. Moreover, the inactivation of pocket proteins by the adenovirus E1a protein, and subsequent release of E2F, failed to displace nuclear E2F. Our study identifies a new level of regulation in the control of E2F activity exerted at the level of nuclear accumulation where subunit composition and interaction with pocket proteins dictates the functional consequence on cell cycle progression." @default.
• W2116723357 created "2016-06-24" @default.
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• W2116723357 date "1997-11-15" @default.
• W2116723357 modified "2023-10-01" @default.
• W2116723357 title "Distinct mechanisms of nuclear accumulation regulate the functional consequence of E2F transcription factors" @default.
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• W2116723357 doi "https://doi.org/10.1242/jcs.110.22.2819" @default.
• W2116723357 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9427290" @default.
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